Mitigation and degradation of natural organic matters (NOMs) during ferrate(VI) application for drinking water treatment

Yali Song, Yang Deng, Chanil Jung

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

Ferrate(VI), as an alternative for pre-oxidation in drinking water treatment, has recently captured renewed interest. However, the knowledge in ferrate(VI) chemistry remains largely undeveloped. The information regarding ferrate(VI) reactions with natural organic matters (NOMs), an important water matrix component affecting water treatment, is highly limited. In this study, bench scale tests were performed to study ferrate(VI) decay and reactions with NOMs in a typical surface water matrix. Results showed that ferrate(VI) decay exhibited a pseudo 2nd-order reaction pattern (k obs = 15.2-1.6 mM -1 min -1 and 36.3-4.0 mM -1 min -1 with 1.0-7.0 mg/L Fe(VI) at initial pH 7.8 and 5.8, respectively), suggesting that self-decomposition is principally responsible for ferrate(VI) consumption. Ferrate(VI) tended to attacked electron-rich moieties in NOM molecules, but had limited capability to mineralize NOMs. Consequently, ferrate(VI) effectively reduced UV 254 and specific UV absorbance (SUVA 254 ), but poorly removed dissolved organic carbon (DOC). Generally, lower pH and higher ferrate(VI) dose favored the NOM destruction. Fe(VI) (3.0 mg/L) could remove 16% of initial DOC (4.43 mg/L), 56% of initial UV 254 (0.063 cm -1 ), and 48% of initial SUVA 254 (0.033 cm -1 (mg/L) -1 ) at pH 5.80. Further organics analyses indicate that ferrate(VI) readily degraded hydrophobic and transphilic NOM fractions, but scarcely decomposed hydrophilic fraction. Fluorescence excitation-emission matrix (EEM) and fluorescence regional integration (FRI) analyses revealed that ferrate(VI) preferentially reacted with fulvic-like (region III) and humic-like (region V) substances and certain aromatic proteins (region II), difficultly decomposed soluble microbial byproducts (region IV), and rarely oxidized aromatic proteins in region I.

Original languageEnglish
Pages (from-to)145-153
Number of pages9
JournalChemosphere
Volume146
DOIs
StatePublished - 1 Mar 2016

Fingerprint

Water Purification
Water treatment
Potable water
Drinking Water
Biological materials
mitigation
organic matter
Degradation
degradation
Organic carbon
dissolved organic carbon
matrix
fluorescence
Fluorescence
Proteins
protein
Surface waters
absorbance
Byproducts
ferrate ion

Keywords

  • Chemical oxidation
  • Coagulation
  • Dissolved organic carbon (DOC)
  • Ferrate(VI)
  • Natural organic matters (NOM)
  • Ultraviolet absorption

Cite this

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title = "Mitigation and degradation of natural organic matters (NOMs) during ferrate(VI) application for drinking water treatment",
abstract = "Ferrate(VI), as an alternative for pre-oxidation in drinking water treatment, has recently captured renewed interest. However, the knowledge in ferrate(VI) chemistry remains largely undeveloped. The information regarding ferrate(VI) reactions with natural organic matters (NOMs), an important water matrix component affecting water treatment, is highly limited. In this study, bench scale tests were performed to study ferrate(VI) decay and reactions with NOMs in a typical surface water matrix. Results showed that ferrate(VI) decay exhibited a pseudo 2nd-order reaction pattern (k obs = 15.2-1.6 mM -1 min -1 and 36.3-4.0 mM -1 min -1 with 1.0-7.0 mg/L Fe(VI) at initial pH 7.8 and 5.8, respectively), suggesting that self-decomposition is principally responsible for ferrate(VI) consumption. Ferrate(VI) tended to attacked electron-rich moieties in NOM molecules, but had limited capability to mineralize NOMs. Consequently, ferrate(VI) effectively reduced UV 254 and specific UV absorbance (SUVA 254 ), but poorly removed dissolved organic carbon (DOC). Generally, lower pH and higher ferrate(VI) dose favored the NOM destruction. Fe(VI) (3.0 mg/L) could remove 16{\%} of initial DOC (4.43 mg/L), 56{\%} of initial UV 254 (0.063 cm -1 ), and 48{\%} of initial SUVA 254 (0.033 cm -1 (mg/L) -1 ) at pH 5.80. Further organics analyses indicate that ferrate(VI) readily degraded hydrophobic and transphilic NOM fractions, but scarcely decomposed hydrophilic fraction. Fluorescence excitation-emission matrix (EEM) and fluorescence regional integration (FRI) analyses revealed that ferrate(VI) preferentially reacted with fulvic-like (region III) and humic-like (region V) substances and certain aromatic proteins (region II), difficultly decomposed soluble microbial byproducts (region IV), and rarely oxidized aromatic proteins in region I.",
keywords = "Chemical oxidation, Coagulation, Dissolved organic carbon (DOC), Ferrate(VI), Natural organic matters (NOM), Ultraviolet absorption",
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Mitigation and degradation of natural organic matters (NOMs) during ferrate(VI) application for drinking water treatment. / Song, Yali; Deng, Yang; Jung, Chanil.

In: Chemosphere, Vol. 146, 01.03.2016, p. 145-153.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Mitigation and degradation of natural organic matters (NOMs) during ferrate(VI) application for drinking water treatment

AU - Song, Yali

AU - Deng, Yang

AU - Jung, Chanil

PY - 2016/3/1

Y1 - 2016/3/1

N2 - Ferrate(VI), as an alternative for pre-oxidation in drinking water treatment, has recently captured renewed interest. However, the knowledge in ferrate(VI) chemistry remains largely undeveloped. The information regarding ferrate(VI) reactions with natural organic matters (NOMs), an important water matrix component affecting water treatment, is highly limited. In this study, bench scale tests were performed to study ferrate(VI) decay and reactions with NOMs in a typical surface water matrix. Results showed that ferrate(VI) decay exhibited a pseudo 2nd-order reaction pattern (k obs = 15.2-1.6 mM -1 min -1 and 36.3-4.0 mM -1 min -1 with 1.0-7.0 mg/L Fe(VI) at initial pH 7.8 and 5.8, respectively), suggesting that self-decomposition is principally responsible for ferrate(VI) consumption. Ferrate(VI) tended to attacked electron-rich moieties in NOM molecules, but had limited capability to mineralize NOMs. Consequently, ferrate(VI) effectively reduced UV 254 and specific UV absorbance (SUVA 254 ), but poorly removed dissolved organic carbon (DOC). Generally, lower pH and higher ferrate(VI) dose favored the NOM destruction. Fe(VI) (3.0 mg/L) could remove 16% of initial DOC (4.43 mg/L), 56% of initial UV 254 (0.063 cm -1 ), and 48% of initial SUVA 254 (0.033 cm -1 (mg/L) -1 ) at pH 5.80. Further organics analyses indicate that ferrate(VI) readily degraded hydrophobic and transphilic NOM fractions, but scarcely decomposed hydrophilic fraction. Fluorescence excitation-emission matrix (EEM) and fluorescence regional integration (FRI) analyses revealed that ferrate(VI) preferentially reacted with fulvic-like (region III) and humic-like (region V) substances and certain aromatic proteins (region II), difficultly decomposed soluble microbial byproducts (region IV), and rarely oxidized aromatic proteins in region I.

AB - Ferrate(VI), as an alternative for pre-oxidation in drinking water treatment, has recently captured renewed interest. However, the knowledge in ferrate(VI) chemistry remains largely undeveloped. The information regarding ferrate(VI) reactions with natural organic matters (NOMs), an important water matrix component affecting water treatment, is highly limited. In this study, bench scale tests were performed to study ferrate(VI) decay and reactions with NOMs in a typical surface water matrix. Results showed that ferrate(VI) decay exhibited a pseudo 2nd-order reaction pattern (k obs = 15.2-1.6 mM -1 min -1 and 36.3-4.0 mM -1 min -1 with 1.0-7.0 mg/L Fe(VI) at initial pH 7.8 and 5.8, respectively), suggesting that self-decomposition is principally responsible for ferrate(VI) consumption. Ferrate(VI) tended to attacked electron-rich moieties in NOM molecules, but had limited capability to mineralize NOMs. Consequently, ferrate(VI) effectively reduced UV 254 and specific UV absorbance (SUVA 254 ), but poorly removed dissolved organic carbon (DOC). Generally, lower pH and higher ferrate(VI) dose favored the NOM destruction. Fe(VI) (3.0 mg/L) could remove 16% of initial DOC (4.43 mg/L), 56% of initial UV 254 (0.063 cm -1 ), and 48% of initial SUVA 254 (0.033 cm -1 (mg/L) -1 ) at pH 5.80. Further organics analyses indicate that ferrate(VI) readily degraded hydrophobic and transphilic NOM fractions, but scarcely decomposed hydrophilic fraction. Fluorescence excitation-emission matrix (EEM) and fluorescence regional integration (FRI) analyses revealed that ferrate(VI) preferentially reacted with fulvic-like (region III) and humic-like (region V) substances and certain aromatic proteins (region II), difficultly decomposed soluble microbial byproducts (region IV), and rarely oxidized aromatic proteins in region I.

KW - Chemical oxidation

KW - Coagulation

KW - Dissolved organic carbon (DOC)

KW - Ferrate(VI)

KW - Natural organic matters (NOM)

KW - Ultraviolet absorption

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U2 - 10.1016/j.chemosphere.2015.12.001

DO - 10.1016/j.chemosphere.2015.12.001

M3 - Article

VL - 146

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EP - 153

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

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